Packing strip



Jan. 17, 1939. c. .1. RANDALL PACKING STRIP Filed May 19, 1936 INVENT OR.

ORNEY.

Patented Jan. 17, 1939 4 UNITED STATES PATENT OFFICE PACKING STRIP Chester J. ItandalL Naugatuck, Conn, assignor, by mesne assignments, to United States Rubber Company, New 'York, N. Y., a corporation of New Jersey Application May 19, 1936, Serial No. 80,646

2 Claims. (01. 2069) This invention relates to an improved packing Figure 1 is an isometric view of a section of strip and its use, in combination with a closure an improved packing strip embodying this inmember to form a seal against the passage of air vention; and between such member and its cooperating fr'ame. Figure 2 is a cross section of a closure and the The packing strip embodying this invention is frame therefor having the packing strip applied 5 particularly useful for sealing the seam between thereto. the door of an automobile and its cooperating As illustrated in Fig. l, the packing strip 8 comframe or door jamb. Where used in such conprises a flange 9 and a bead portion Ill having a struction the strip is provided with a bead and a composite core II. The core is formed in part of flange. Packing strips of this general construea segment I2 of soft resilient material, preferably 10 tion have been used heretofore for the same purof soft sponge rubber, and is formed in part of a pose. Such prior packing strips have been made segment I3 of more firm material which is preferwith a bead having a core consistingv of either ably pliable in all directions. For example, the relatively soft or more firm materials. According segment I3 may be made of soft dense or solid to the usual practice, the flange is secured to the vulcanized rubber or of a material sold under the 15 door jamb and the bead extends into the door trade name of Plioform, a rubber isomer which opening and when the door is closed it contacts may be made by treating rubber with an isomerizwith the bead for the purpose of forming a seal ing agent such as stannic chloride. The segagainst the passageof air through the seam bements I2 and I3 are adhered together and to a tween the door and its jamb. The strips having cover I4. Where the segments l2 and I3 are 20 cores composed of soft material do not form a made of rubber the foregoing parts are vulcanized good seal because the material along the oppostogether as a unit. The core II is preferably ing line supported by the door jamb yields readily made in the form of a cylinder. The cover I4 is and permits the bead to roll backward away from preferably made of a strip of fabric which enthe door without sufilciently compressing the closes the core and its longitudinal edges I5 25 core material along the face of the door to cause extend laterally from the core to provide the it to conform to its irregularities and thereby flange 9. form a good seal. Where more firm material is In the event the segment I3 is made of dense used in the 'core the bead may not roll backward rubber it is preformed into a strip which is semito the same extent as the bead containing the cured and coated with rubber cement and is 30 softer material, but the more firm material may placed in the fabric cover I4 with a strip of unnot yield sufficiently to form a good seal along its cured sponge rubber, the latter material forming line of contact with the door and in any event the segment I2. In the event the segment I3 is where the core is composed entirely of either soft made of Plioform the fabric cover I4 is run 5 or more firm material the bead is deformed as through a calender and the Plioform is calenmuch along theline where it is supported by the dered directly on to the cover in the form of a door jamb as it is by the door face and all of strip. A strip of uncured sponge rubber is then the deformation does not take place along the superposed on the cover I4 in juxtaposed relaline of contact of the bead with the door as is detion to the preformed resistance segment I3 of sirable in order to obtain the best seal. Plioform. In each event both segments are 40 For the purpose of forming an improved seal it -wrapped in the fabric cover, and the core II is is among the objects of this invention to provide vulcanized therein which may be done in a vula packing strip having a bead containing a core canizing press or by continuously pulling the consisting in part of soft resilient material which fabric cover I4 containing the core H t u a is adapted to yield when pressed by either the heated tube having alongitudinal slot in one side, 5 closure or the frame for same, and consisting as described in United States Patent No. 1,629,013. in part of a more firm material which is adapted Fig. 2 illustrates an application of the strip 8 to resist the pressure of the closure or the frame to an automobile door jamb l6 for sealing the to a greater extent than the softer material and seam.I6' between it and an automobile door I1.

0 thereby support the softer material and cause The door I! is shown in its closed position and 5 the bead to be deformed almost entirely along its inside I8 abuts against the bead I ll opposite the line where the seal is to be formed. 7 to the sponge rubber segment I2. The flange 9 The foregoing objects will be more clearly of the cover is secured between the upholstery understood by referring to the following descripmaterial I9 and the door jamb I6 by means of tion and accompanying drawing in which: tacks 20. The bead I II opposite the soft solid Ill vulcanized rubber segment l3 abuts against the upholstery material 59 and forms a firm support for the soft sponge rubber segment l2. When the door contacts with the bead ill, the core portion is supported by the solid rubber l3 while the soft sponge rubber segment [12 yields. Consequently, substantially all of the deformation of the bead l0 occurs along the sealing line of contact which is formed by the flat sealing surface 25 produced by the pressure of the door ll against the soft resilient sponge rubber segment l2.

While the preferred embodiments of this invention have been described herein, it will be understood that changes in the details thereof may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Having thus described my invention what I claim and desire to protect by Letters Patent is:

1. A packing strip comprising a bead having a core formed in part of a segment of soft resilient material and in part of a segment of more firm material, each of said segments forming a substantial portion of the outer -,urface of said core, a cover enclosing said core and adhered to both of said segments and having its longitudinal edges extending laterally from said core and offset from the principal portion of said firm segment.

2. A packing strip comprising a bead having a core formed in part of a segment of soft sponge rubber adapted to yield when pressure is applied thereto, said core being formed in part of a segment of soft solid vulcanized rubber adapted to resist such pressure and support the soft sponge rubber, each of such segments forming a substantial portion of the outer surface of said core, a fabric cover enclosing and vulcanized to said core and having edges extending laterally therefrom to form a flange on said bead, and said flange extending radially from said core substantially along the line of division between said segments.

CHESTER J. RANDALL. 

